Alright, let's work through 1866 times 8160 step by step
1866 × 8160 = 8160 × (1866)
+ 8160 × 6 that equals 48960
+ 8160 × 60 that is equal 489600
+ 8160 × 800 that results in 6528000
+ 8160 × 1000 which equals 8160000

= 15226560
